Hi,
I'm working with a9g connected to esp32 and I'd like to work outside with power supply. I'm not sure about electronics but If I want to power both with a 3.7V 18560 battery, I need to drop the voltage to 3.2V with a DC-DC power module ( or resistors ) to connect to esp32 and keep 3.7 for a9g.
Is it true?
And How can I control the battery status ? to avoid overdischarge?
Thanks in advance
NO lithium ion battery is 3.7V. That is a NOMINAL rating. The range is 3.2 to 4.2V.
I don't know anything about the A9G, but you will need a buck-boost converter to go from battery to 3V3.
Thanks @timinelmira ,
Then the buck-boost to drop voltage to 3v for esp32 and keep direct from battery for a9g (range 3.5V-4.2V)
Thanks, I will try.
Even if you could find a buck-boost, you would not want to set it o 3.0V.
The ESP32 operating range is 3.0V to 3.6V. If your buck-boost had an accuracy of 2% then the output voltage could be anywhere between 2.94V and 3.06 and 2.94V is below the minimum.
Thanks @jim-p ,
I never think about range and margin.
Many people don't and then come to the forum asking why it works perfectly with this buck-boost but not that one.
I think the best solution would be to look for a buck that can provide a 3.3V output with a minimum input of 3.6V and be happy with that.
Thanks again
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